Thermal Waves and Heat Transfer Efficiency Enhancement in Harmonically Modulated Turbulent Thermal Convection

0564191 - ÚPT 2023 RIV US eng J - Journal Article
Urban, Pavel - Hanzelka, Pavel - Králík, Tomáš - Musilová, Věra - Skrbek, L.
Thermal Waves and Heat Transfer Efficiency Enhancement in Harmonically Modulated Turbulent Thermal Convection.
Physical Review Letters. Roč. 128, č. 13 (2022), č. článku 134502. ISSN 0031-9007. E-ISSN 1079-7114
R&D Projects: GA ČR(CZ) GA20-00918S
Institutional support: RVO:68081731
Keywords : Harmonically Modulated Thermal Convection * Rayleigh-Bénard convection * Turbulent Convection * Thermal Waves * Heat Transfer Efficiency
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 8.6, year: 2022
Method of publishing: Limited access
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.128.134502

We study turbulent Rayleigh-Bernard convection over four decades of Rayleigh numbers 4 x 10(8) < Ra < 2 x 10(12), while harmonically modulating the temperatures of the plates of our cylindrical cell. We probe the flow by temperature sensors placed in the cell interior and embedded in the highly conducting copper plates and detect thermal waves propagating at modulation frequency in the bulk of the convective flow. We confirm the recent numerical prediction [Yang et al., Phys. Rev. Lett. 125, 154502 (2020)] of the significant enhancement of the Nusselt number and report its dependence on the frequency and amplitude of the temperature modulation of plates.
Permanent Link: https://hdl.handle.net/11104/0335925